This is a set of counterweights precisely threaded for the pre-threaded hole on the fan side of an Explore Scientific Dobsonian's mirror box. It contains two (2) 2.5lb weights and a 14mm counterweight shaft to support them. Both weights will fit on the shaft at once while it is inserted into the hole on the mirror box. Just remove the rubber cover protecting that hole and slide in the bar, then add weight until your telescope is perfectly balanced!

• Shaft: 14mm Counterweight Shaft
• Two (2) 2.5 lbs Counterweights sized for 14mm Shaft
• Sized for Explore Scientific Dobsonians